package com.skillworld.webapp.web.pages.rest.school;

import org.apache.tapestry5.annotations.ContentType;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.annotations.SessionState;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

import com.skillworld.webapp.model.courseservice.CourseService;
import com.skillworld.webapp.model.lesson.Exam;
import com.skillworld.webapp.model.util.PermissionDeniedException;
import com.skillworld.webapp.web.util.ErrorMessages;
import com.skillworld.webapp.web.util.Parameter;
import com.skillworld.webapp.web.util.UserSession;

import es.udc.pojo.modelutil.exceptions.InstanceNotFoundException;

@ContentType("text/xml")
public class CreateExam {
	
	@SuppressWarnings("unused")
    @Property
    private String errorMessage = null;
	
	@SuppressWarnings("unused")
    @Property
	private Exam exam;
	
    @Inject
    private CourseService courseService;
	
    @SessionState(create=false)
    private UserSession userSession;
   
    private boolean userSessionExists;
   
    @Inject
    private Request request;


    void onPassivate()
    { 
        return; 
    }
    
    void onActivate()
    {
        if (!userSessionExists)
        {
            errorMessage = ErrorMessages.NOT_LOGGED_IN;
            return;
        }

        String lessonParam = request.getParameter("lesson");
        String fileURL = request.getParameter("file");
        
        if (lessonParam == null || fileURL == null)
        { 
            errorMessage = ErrorMessages.INVALID_ARGUMENTS;
            return;
        }
        
        try
        { 
            long lessonId = Parameter.maybeLong(lessonParam);
            exam = courseService.createExam(userSession.getUserId(), 
                                                lessonId, fileURL);       
        }
        catch (NumberFormatException e)
        { errorMessage = ErrorMessages.INVALID_ARGUMENTS; }
        catch (InstanceNotFoundException e)
        { errorMessage = ErrorMessages.LESSON_NOT_FOUND;  }
        catch (PermissionDeniedException e)
        { errorMessage = ErrorMessages.PERMISSION_DENIED;  }
    }
}
    

